CURRENT PROPAGATION CONDITIONS.: Solar-terrestrial indices for 17 August follow. Solar flux 67 and estimated planetary A-index 13. The estimated planetary K-index at 1500 UTC on 18 August was 3. No space weather storms were observed for the past 24 hours. No space weather storms are predicted for the next 24 hours.

ALERT CONDITION: WHISKY ( WHITE )

Saturday, August 18, 2018 - 17:21 GMT - UPDATE # 35

OPERATIONAL FORECAST. - GEOMAGNETIC FIELD. The geomagnetic field is expected to be quiet and unsettled for the remainder of 18 Aug and generally quiet conditions are expected on 19 Aug as CH HSS influence wanes and subsides. Unsettled and active conditions are expected on 20 Aug due to the influence of a negative polarity CH HSS. .- SOLAR ACTIVITY. Solar activity is expected to be very low on 18-20 Aug.

G/S/R SCALES USED     DEF'S USED     LIGHTNING - (QRN)


HF OPERATIONAL BRIEFING - CURRENT CONDITIONS IN DETAIL

CURRENT SOLAR CONDITIONS


VISIBLE DISK

 


SOLAR MAGNETOGRAM

 


NEAR INFRARED

 


SUNSPOT TRACKING

 

Solar activity was very low. Region 2718 (S07E04, Hrx/alpha) remained unchanged from the previous period. No Earth-directed CMEs were observed in available coronagraph imagery.


RADIO BLACKOUTS - SOLAR STORMS - GEOMAGNETIC STORMS

The geomagnetic field reached active levels due to the waning influence of a positive polarity CH HSS.


"D" LAYER - HF ATTENUATION LEVELS


AURORA  -   NORTH POLE  - SHORT PATH